The small SLA battery in jumpstarters isnt designed for deep cycles.
They arent supposed to be discharged past 60-70% of their total capacity because of sulphation. This happens when the cells voltages drop past a certain point. Sulphation permanently reduces capacity and overall lifespan.
AGM battery is recommended because they can be discharged much deeper, around 40-50%.
Quote:
Originally Posted by raymo
Many purists will advise against it, but I have used a car battery for
this purpose for nearly 35 yrs, and never had a problem. In winter
when using dew heaters etc I use one for the mount, and one for the
ancillary gear.The old ex Corolla battery will run my HEQ5 for three
imaging sessions between charges.
Now wait for all the posts to come in. It's interesting to read all the
opinions.
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A car battery is fine because its got a higher capacity to discharge, whereas that cheap SCA jumpstarter only has a 24Ah battery inside.
Jumpstarts die so easily because people discharge them to the point where the voltages are so low even the charger wont detect it.